Unnamed (east of upper Canyon Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; As
Ore minerals chalcocite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale B-4
Latitude 61.3369
Longitude -142.1753
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the ridge crest between Twaharpies Glacier and Canyon Creek. It is at elevation 7470 in the NW1/4 of section 22, T. 6 S., R 18 E. of the Copper River Meridian. This is locality 46 of MacKevett (1976); the location is accurate to within about 100 feet.

Geologic setting

Geologic description

This occurrence consists of a 6-foot-wide fault zone that contains narrow veins with chalcocite and malachite (MacKevett and Smith, 1968; MacKevett, 1976). A sample of the mineralization contained up to 7 parts per million (ppm) silver, 1,000 ppm arsenic, and more than 20,000 ppm copper. The fault zone cuts Triassic Nikolai Greenstone (MacKevett and Smith, 1972). Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
Geologic map unit (-142.177340372222, 61.336483759861)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23)
Mineral deposit model number 23
Age of mineralization Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
Alteration of deposit Oxidation.

Production and reserves

Workings or exploration Only limited surface sampling.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011693

References

Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003